Question about 2003 Pontiac Sunfire

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Service engine light stays on car runs good replaced gas cap per parts store what else could it be?

Also fog lights inop???

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Well, don't guess at it like that, get a readout of the trouble code stored in the car's ECU. Any auto mech can do this for you, and in the USA Autozone as well.

You will find a code like P0135 or some such, and this will have a meaning specific to your car, so you can home in on the fault.

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

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SOURCE: Service engine soon light on

My 2002 pontiac has the exact same problem. I took it to my trustworthy mechanic and he told me that there is three Oxygen sensors in the emissons system. This light came on when one of them went bad. He said it is no big deal to have one go out, however if the second one goes out the car will start missing and running rough. Keep an eye on the performance of your car and if it does not dimenish then you should be alright. Fyi the oxygen sensor costs about $80 plus labor to replace it.

Posted on Dec 18, 2008

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SOURCE: service engine soon light on

you need to put it on a computer to find what the code is such as on o2 sensor or a number of other things. once you know the codes you can fix the problem

Posted on Dec 20, 2008

  • 179 Answers

SOURCE: Fog Lamps on 2003 Pontiac Sunfire Not Working

check ground at fog lamps.

Posted on Mar 28, 2009

  • 11 Answers

SOURCE: No start! Help!

the throttle position sensor can cause it to do that

Posted on Sep 21, 2009

Testimonial: "Thanks for the confirmation on the T.P.S. issue no i jus have a few other issues to clear up but at least it runs now! Thanks again!"

  • 14036 Answers

SOURCE: Engine check light comes on and stays on for

IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.

Posted on May 23, 2010

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1 Answer

Gas cap service engine soon light comes and stays on?


Sorry mate, I dont know what this Gas cap is, could be the fuel filler cap, could be the car runs on LPG and it is a cap on the Gas charge line.

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1 Answer

Reset service engine soon light


You have a real auto repair shop ( not auto parts store) look at stored codes, & any freeze frame data
Do not clear the dash light or you loose data & ability
to diagnose & resolve the issue

Jul 11, 2013 | 2002 Mitsubishi Galant

1 Answer

Check engine light came on and code said to replace gas cap, did that and two weeks later check engine came on same code, then one day fuel light came on and gauge went to fueull then empty 2 times , now...


You wouldn't think a gas cap would be that important, but it is. When it's loose or cracked, fuel vapors leak out and can throw the whole fuel system off. This causes a reduction in gas mileage and increases emissions.
What causes it: If you get an error pointing to the gas cap it means fuel vapors are leaking out of your cap. This means the cap is either cracked or just wasn't tightened well enough.
What you should do: If your car isn't feeling jerky or strange when the check engine light comes on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.

Aug 11, 2017 | 2004 Chrysler Pacifica

2 Answers

Service engine light is on veliche runs no different . Where are the sensors located?


You might want to check your gas cap. A loose or faulty cap will cause the check engine light to stay on.

Feb 19, 2011 | 2002 Ford Explorer

1 Answer

Check engine light is on again. After driving another 500 miles. the car was services and the found a leak on top of tank. They told me they replaced some cracked cap on top of gas tank. light was off for...


Must be cap is loose again or the cap was not fitted properly and so the check engine light is coming ON again.But if the light is ON again that means the ECM has stored error codes in it.The ECM means Electronic control module,also called cars computer.Get your car scanned at diagnostic scan center,.There you can get the exact error codes for the check engine light coming ON.At www.autozone.com its absolutely free to get car scanned.There you can get the codes for free.As per error codes you can replace the faulty part.-------------- This will help.Thanks.Helpmech.

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1 Answer

Engine light stays on after replacing gas cap on my 2003 Dodge tr


usually a few start ups or mileage will do or go to an auto store some scan vehicles for free such as auto zone / advanced auto check ur local area and have them scan and reset trouble code

Jan 20, 2010 | Dodge Pickup Cars & Trucks

2 Answers

Service engine light stays on. Adjustment of gas


Hi:
The gas cap is usually a good suspect in this case, but to figure it out, you need to have your code scanned to figure out what is causing the light. Most auto parts stores will scan it for free, so give them a shot

Dec 01, 2009 | 2004 Chevrolet TrailBlazer

3 Answers

Check engine light/gas cap will not stay tight.


Yes, the gas cap will cause the Check Engine Light to come on. Will set code P0441 if I remember correctly. It should be okay to drive it. If you would like to confirm the code, take the truck to an auto parts store like Autozone and have them hook up their scan tool and read the code. If its P0441 it will probably be something like EVAP or Evaporative system leak.

Its an easy enough fix while your there too, just pick up a new gas cap or you could pick up an OEM one from the dealership.

Dec 31, 2008 | 2005 Chevrolet Colorado

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